package com.mmall.service.impl;

        import com.github.pagehelper.StringUtil;
        import com.google.common.collect.Lists;
        import com.google.common.collect.Sets;
        import com.mmall.common.ServerResponse;
        import com.mmall.dao.CategoryMapper;
        import com.mmall.pojo.Category;
        import com.mmall.service.ICategoryService;
        import org.apache.commons.collections.CollectionUtils;
        import org.apache.commons.lang3.StringUtils;
        import org.slf4j.Logger;
        import org.slf4j.LoggerFactory;
        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.stereotype.Service;

        import java.util.List;
        import java.util.Set;

/**
 * Created by lenovo on 2017/7/13.
 */

@Service("ICategoryService")
public class CategoryServiceImpl implements ICategoryService {

    private Logger logger= LoggerFactory.getLogger(CategoryServiceImpl.class);
    @Autowired
    private CategoryMapper categoryMapper;

    public ServerResponse addCategory(String categoryName,Integer parentId){
        /*if(parentId==null|| StringUtils.isBlank(categoryName)){
            return ServerResponse.createByErrorMessage("参数错误");
        }
        Category category=new Category();
        category.setName(categoryName);
        category.setParentId(parentId);
        category.setStatus(true);

        int rowCount=categoryMapper.insert(category);
        if(rowCount>0){
            return ServerResponse.createBySuccess("添加品类成功");
        }
        return ServerResponse.createByErrorMessage("添加品类失败");
    }*/
        if(parentId == null || StringUtils.isBlank(categoryName)){
            return ServerResponse.createByErrorMessage("添加品类参数错误");
        }

        Category category = new Category();
        category.setName(categoryName);
        category.setParentId(parentId);
        category.setStatus(true);//这个分类是可用的

        int rowCount = categoryMapper.insert(category);
        if(rowCount > 0){
            return ServerResponse.createBySuccess("添加品类成功");
        }
        return ServerResponse.createByErrorMessage("添加品类失败");
    }

    public ServerResponse updateCategoryName(Integer categoryId,String categoryName){
        if(categoryId==null|| StringUtils.isBlank(categoryName)){
            return ServerResponse.createByErrorMessage("更新品类参数错误");
        }
        Category category=new Category();
        category.setId(categoryId);
        category.setName(categoryName);
        int rowCount=categoryMapper.updateByPrimaryKeySelective(category);
        if(rowCount>0){
            return ServerResponse.createBySuccess("更新品类名字成功");
        }
        return ServerResponse.createByErrorMessage("更新品类名字失败");
    }

    public ServerResponse<List<Category>> getChildrenParallelCategory(Integer categoryId){
        List<Category> categoryList=categoryMapper.selectCategoryChildrenByParentId(categoryId);
        if (CollectionUtils.isEmpty(categoryList)) {
            logger.info("未找到当前分类的子分类");
        }
        return ServerResponse.createBySuccess(categoryList);
    }

    /**
     * 递归查询本节点的id及孩子节点的id
     * @param categoryId
     * @return
     */
    public ServerResponse selectCategoryAndChildrenById(Integer categoryId){
        //初始化categorySe
        Set<Category> categorySet= Sets.newHashSet();
        findChildCategory(categorySet,categoryId);

        List<Integer> categoryList= Lists.newArrayList();
        if(categoryId!=null){
            for(Category categoryItem:categorySet){
                categoryList.add(categoryItem.getId());
            }
        }
        return ServerResponse.createBySuccess(categoryList);
    }

    //递归算法，算出子节点
    private Set<Category> findChildCategory(Set<Category>categorySet,Integer categoryId){
        Category category=categoryMapper.selectByPrimaryKey(categoryId);
        if(category!=null){
            categorySet.add(category);
        }
        //查找子节点，递归算法一定要有一个退出的条件
        List<Category> categoryList=categoryMapper.selectCategoryChildrenByParentId(categoryId);
        //此处如果categoryList为空，则进不去for循环，直接return，递归结束;
        for(Category categoryItem : categoryList){
            findChildCategory(categorySet,categoryItem.getId());
        }
        return categorySet;
    }
}
